Grill box



FIG. 1 is a front perspective view of a grill box with the lid in an open position showing our new design;

FIG. 2 is a front perspective view thereof with the lid in a closed position;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a right side view thereof.

The details shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a grill box, as shown and described. 